Abstract: This invention provides remote control devices, electronic apparatuses, and their controlling methods. In an embodiment, a remote control device having buttons is used to control an electronic apparatus having a screen, and the user employs the buttons and the screen to disable one or more of the buttons.

Abstract: A method of enhancing a contrast ratio of a picture of a display device, comprising steps of providing the display device having a light source; continuously receiving plural display signals; and turning off the light source when the display device has a buffer time during which each of the continuously received plural display signals has a picture brightness equal to zero.

Abstract: An electronic device for charging a rechargeable device is provided. The electronic device includes a power-supply-cutoff system and a detecting circuit, which is electrically connected with the power-supply-cutoff system. The detecting circuit controls the power-supply-cutoff system to supply the electrical power to the rechargeable device when the detecting circuit detects the incomplete charging of the rechargeable device.

Abstract: A display apparatus is provided. The display comprises a system module responding to a first frequency to output a second frequency, wherein a magnitude of the second frequency is not an integer multiple of that of the first frequency. The system module comprises a detection circuit detecting the first frequency of the vertical synchronous signal, and a processor producing a plurality of adjacent integers. The display apparatus further comprise an internal light source providing a back light for the display apparatus to display an image, and a light source control module responding to an intermittent pulse to output a drive pulse to the internal light source for controlling one of an operation on and an operation off of the internal light source, wherein the display apparatus prevents the drive pulse from interfering with the image by using the intermittent pulse.

Abstract: A display device is provided. The display device includes a system module detecting an image signal and outputting a first frequency in response thereto, wherein the first frequency is adjusted to a second frequency when the image signal is switched.

Abstract: A television includes a light source, a pulse-width-modulation (PWM) controller, and a control component. The PWM is coupled electrically to the light source, and is operable so as to generate a source control signal for controlling turning on and turning off of the light source. The control component is coupled to the PWM controller for controlling frequency of the source control signal outputted by the PWM controller. The control component has a plurality of control states that correspond to distinct display scanning frequencies of television standards, respectively. Setting of the control component in a selected one of the control states results in control of the frequency of the source control signal outputted by the PWM controller such that the frequency of the source control signal is not an integer multiple of the distinct display scanning frequency that corresponds to the selected one of the control states.

Abstract: A television includes a light source, a pulse-width-modulation (PWM) controller, and a control component. The PWM is coupled electrically to the light source, and is operable so as to generate a source control signal for controlling turning on and turning off of the light source. The control component is coupled to the PWM controller for controlling frequency of the source control signal outputted by the PWM controller. The control component has a plurality of control states that correspond to distinct display scanning frequencies of television standards, respectively. Setting of the control component in a selected one of the control states results in control of the frequency of the source control signal outputted by the PWM controller such that the frequency of the source control signal is not an integer multiple of the distinct display scanning frequency that corresponds to the selected one of the control states.

Abstract: A display device is adapted for receiving an image signal having a display scanning frequency, and includes an internal light source, a light source adjustment module, and a control module. The light source adjustment module includes a pulse-width-modulation controller that generates a source control signal for controlling turning on and turning off of the internal light source. The control module includes a frequency detecting circuit for detecting the display scanning frequency of the image signal, and a plurality of range adjustment circuits. The frequency detecting circuit actuates one of the range adjustment circuits according to the detected display scanning frequency for subsequent control of the pulse-width-modulation controller such that the latter generates the source control signal within a preset frequency range which has turning on and turning off frequencies that are not integer multiples of the detected display scanning frequency.